New and little-known shell-bearing heterobranch mollusks (Heterobranchia: Aplustridae and Cephalaspidea) from the bathyal zone of the northwestern part of the Sea of Japan

Chaban, E.M.; Chernyshev, A. V.

doi:10.1016/j.dsr2.2012.07.040

Cited by 10 publications

(7 citation statements)

References 11 publications

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“…The three described species of Parvaplustrum have been classified as dubious members of the euthyneuran clade Acteonoidea based on their fragile, oval ‘bubble’ shells and presence of an external copulatory organ 28 , 41 , 42 . Interestingly, although not commented upon by previous authors 26 , 27 , 42 , 43 , Tjaernoeia and Parvaplustrum principally resemble lower heterobranchs in the outline of head-foot morphology but also share a unique condition of long, basally forked head tentacles. We found that inclusion of these taxa in a phylogenetic analysis greatly improves resolution of relationships within Heterobranchia and provides a novel scenario on the evolution of the head tentacles and nervous system of Euthyneura.…”

Section: Introductionmentioning

confidence: 67%

“…Past morphological studies on Tjaernoeia and Parvaplustrum were confounded by their extremely small body sizes, which resulted in the examination of only the shell, external anatomy and chitinous internal structures ( 26 – 28 , 41 – 43 ). Species of Tjaernoeia bear a broad, somewhat flattened, coiled shell, similar to those of some other heterobranchs, in particular lower heterobranch taxa such as the Valvatoidea 27 .…”

Section: Resultsmentioning

confidence: 99%

“…Hydatina and Haminoea , see Fig. 2 q) 28 , 41 – 43 . Based on our study of aligned serial histological sections and three-dimensional reconstructions of the body shape and internal organs, we here show aspects of microanatomy for the type species of each genus, namely the North Atlantic Tjaernoeia exquisita (Jeffreys, 1883)(Fig.…”

Section: Resultsmentioning

confidence: 99%

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Origin and significance of two pairs of head tentacles in the radiation of euthyneuran sea slugs and land snails

Brenzinger

Schrödl

Kano

2021

Sci Rep

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The gastropod infraclass Euthyneura comprises at least 30,000 species of snails and slugs, including nudibranch sea slugs, sea hares and garden snails, that flourish in various environments on earth. A unique morphological feature of Euthyneura is the presence of two pairs of sensory head tentacles with different shapes and functions: the anterior labial tentacles and the posterior rhinophores or eyestalks. Here we combine molecular phylogenetic and microanatomical evidence that suggests the two pairs of head tentacles have originated by splitting of the original single tentacle pair (with two parallel nerve cords in each tentacle) as seen in many other gastropods. Minute deep-sea snails of Tjaernoeia and Parvaplustrum, which in our phylogeny belonged to the euthyneurans’ sister group (new infraclass Mesoneura), have tentacles that are split along much of their lengths but associated nerves and epidermal sense organs are not as specialized as in Euthyneura. We suggest that further elaboration of cephalic sense organs in Euthyneura closely coincided with their ecological radiation and drastic modification of body plans. The monotypic family Parvaplustridae nov., superfamily Tjaernoeioidea nov. (Tjaernoeiidae + Parvaplustridae), and new major clade Tetratentaculata nov. (Mesoneura nov. + Euthyneura) are also proposed based on their phylogenetic relationships and shared morphological traits.

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Section: Introductionmentioning

confidence: 67%

Section: Resultsmentioning

confidence: 99%

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Origin and significance of two pairs of head tentacles in the radiation of euthyneuran sea slugs and land snails

Brenzinger

Schrödl

Kano

2021

Sci Rep

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“…Есть мнение, что виды рода Diaphana Brown, 1827 питаются бактериальными пленками (Б. Кунин, личное сообщение). Они обладают вздутой пентагональной или шаровидной очень тонкой раковинкой и длинной тонкой ногой, раздвоенной на конце, а латеральные зубы радулы широкие с тупыми концами и очень мелкими тупыми зубчиками, заметными только под электронным микроскопом (Schiøtte 1989;Chaban and Chernyshev 2013). Морфология раковины и цефалоподиума позволяет отнести виды этого рода к представителям эпифауны.…”

Section: ем чабан 200unclassified

Shell-bearing mollusks of the order Cephalaspidea (Gastropoda: Heterobranchia) of the Kara Sea: fauna and ecology

Chaban

2021

Proceedings ZIN

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The survey of shell-bearing heterobranchs of the order Cephalaspidea of the Kara Sea has been done based on unpublished and literature data. The studied material includes that collected during expeditions aboard R/V Professor Multanovskiy in August–September 2019 and R/V Dalnie Zelentsy in August 2012. Additionally, the material of collections of the Zoological Institute of the Russian Academy of Sciences (Saint Petersburg) has been studied. The fauna of heterobranch molluscs of the order Cephalaspidea in the Kara Sea includes 18 described and 1 undescribed species that belong to 10 genera and 6 families. It has been specified that the type locality of Retusa semen Reeve, 1855 (Port Refuge) is located at Port Refuge National Historic Site of Canada, Devon Island, Nunavut, not in the Kara Sea. Retusa semen is considered here as species inquirenda because of the brief original description, significant differences in drawings of the shell of this species made by different authors, and the absence of type specimens. The presence of Diaphana minuta Brown, 1827, Laona quadrata (Wood, 1839), Philine sinuata Stimpson, 1851 and Retusa semen in the Kara Sea needs confirmation. Species numbers of heterobranch molluscs of the order Cephalaspidea decrease from the Barents Sea (21) through the Kara Sea (19) to the Laptev Sea (15) because of the decreasing proportion of boreal-arctic species. Among cephalaspids of the Kara Sea, the highest average abundance (individuals/m2) was observed for Cylichnoides densistriatus (Leche, 1878), and the highest average biomass for Cylichna corticata (Møller, 1842). The proportion of live individuals in the populations does not exceed 18% in late August – early September. The taxonomic structure of the cephalaspid fauna of the Kara Sea has been studied based exclusively on morphological characters. Further study of the fauna is needed based on molecular analyses of the material fixed in 96˚ alcohol.

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“…The analysis of gizzard plates (the main character utilized to distinguish retusid genera: see Chaban, 2000) of R. parvula from off Fiumicino (Latium, Italy) (Fig. 3E-F) revealed a typical Retusa morphology (see also Sars, 1878;Pilsbry, 1895;Marcus and Marcus, 1969;Burn and Bell, 1974;Tringali and Oliverio, 2001;Chaban and Chernyshev, 2013). That strongly disagrees with the generic attribution of R. parvula to the genus Cylichna.…”

Section: Taxonomic Remarksmentioning

confidence: 97%

Οικολογικά Πρότυπα Και Πρότυπα Ποικιλότητας Της Ταξοκοινωνίας Των Μαλακίων Σε Ενδιαιτήματα Σκληρού Υποστρώματος Στις Ακτές Της Κρήτης

Πουρσανίδης¹

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Το γενικό αντικείμενο της παρούσας διδακτορικής διατριβής είναι η διερεύνηση των οικολογικών προτύπων και προτύπων ποικιλότητας της ταξοκοινωνίας των Μαλακίων σε σκληρό υπόστρωμα σε διαφορετικές περιοχές των ακτών της Κρήτης στο Ν. Αιγαίο. Ειδικότερα, οι στόχοι της διδακτορικής διατριβής είναι:•Η ανασκόπηση της διαθέσιμης δημοσιευμένης και γκρίζας βιβλιογραφίας σχετικά με την θαλάσσια μαλακοπανίδα της Κρήτης.•Η ανασκόπηση της διαθέσιμης δημοσιευμένης και γκρίζας βιβλιογραφίας σχετικά με τον Οικότοπο 1170 της Κοινοτικής Οδηγίας 92/43/EEC•H ποσοτική καταγραφή της βιοποικιλότητας και διερεύνηση της δυναμικής των συνερεύσεων των Μαλακίων σε επιλεγμένες περιοχές με ενδιαιτήματα σκληρού υποστρώματος στην υποπαραλιακή ζώνη των ακτών της Κρήτης με την εφαρμογή του διεθνούς πρωτόκολλου NaGISA•H διερεύνηση του ρόλου που διαδραματίζουν τα Μαλάκια και οι βενθικές βιοκοινότητες στους μηχανισμούς λειτουργίας του οικοσυστήματος στα συγκεκριμένα ενδιαιτήματα,•O σχεδιασμός και ανάπτυξη μίας βάσης δεδομένων (Database) στην οποία θα καταχωρηθούν τα δεδομένα που θα προκύψουν από την βιβλιογραφική ανασκόπηση της μαλακοπανίδας της Κρήτης, της μαλακοπανίδας του σκληρού υποστρώματος της Μεσογείου (οικότοπος 1170) καθώς και τα αποτελέσματα των ερευνών από την υλοποίηση της παρούσας μελέτης για την μαλακοπανίδα του σκληρού υποστρώματος του Κρητικού πελάγους. Όλα παραχθέντα δεδομένα θα διατεθούν προς για χρήση από την επιστημονική κοινότητα μέσω ελεύθερων data repositories (PANGAEA, Lifewatch).

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New and little-known shell-bearing heterobranch mollusks (Heterobranchia: Aplustridae and Cephalaspidea) from the bathyal zone of the northwestern part of the Sea of Japan

Cited by 10 publications

References 11 publications

Origin and significance of two pairs of head tentacles in the radiation of euthyneuran sea slugs and land snails

Origin and significance of two pairs of head tentacles in the radiation of euthyneuran sea slugs and land snails

Shell-bearing mollusks of the order Cephalaspidea (Gastropoda: Heterobranchia) of the Kara Sea: fauna and ecology

Οικολογικά Πρότυπα Και Πρότυπα Ποικιλότητας Της Ταξοκοινωνίας Των Μαλακίων Σε Ενδιαιτήματα Σκληρού Υποστρώματος Στις Ακτές Της Κρήτης

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