Marine Tubificidae (Oligochaeta) from Hokkaido, Northern Japan, with Descriptions of Two New Species

Takashima, Yoshikazu; Mawatari, Shunsuke F.

doi:10.12782/specdiv.1.55

Cited by 8 publications

(8 citation statements)

References 19 publications

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“…We examined several tubi®cines. Among them was Tubi®coides pseudogaster which originally was reported to possess a thickened and glandular portion of the intestine in segment IX (Dahl, 1960), a condition somewhat supported also by recent observations on Japanese material of this species (Takashima & Mawatari, 1996). However, in the six sectioned specimens of T. pseudogaster examined by us, no particular thickened or glandular part of the oesophagus was observed.…”

Section: Comparison With Other Tubi®cid Speciessupporting

confidence: 82%

“…Two of them have been re-examined in this paper; they both have a thick-walled, granular, short part of the oesophagus in the middle of the segment. Recently, Takashima & Mawatari (1996) described Limnodriloides ezoensis from northern Japan which also possesses a widened and thick-walled oesophagus in segment IX. However, the description is short, and a further investigation is required to enable comparison with the other species.…”

Section: Oesophageal Modi®cations In Limnodriloidinaementioning

confidence: 99%

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Morphology and phylogenetic implications of oesophageal modifications in the Limnodriloidinae (Oligochaeta, Tubificidae)

Gustavsson

Erséus

1999

Journal of Zoology

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Two features have been considered apomorphic for the subfamily Limnodriloidinae (Tubi®cidae): the lobed prostate glands, which are broadly attached to prostatic pads inside the atrial ampullae, and thè modi®ed oesophagus' in segment IX. The homology of the modi®ed oesophagus may be questioned, as it is not of the same kind in all taxa. In Limnodriloides, Smithsonidrilus, and Tectidrilus, there is a pair of diverticula, whereas in Thalassodrilides, Parakaketio, and Doliodrilus, the oesophagus is dilated to form a barrel-shaped portion. In a few species of Limnodriloides lacking diverticula, a short part of the corresponding oesophagus is swollen. A scrutiny of these features shows that they are morphologically different in several aspects: the thickness and the structure of the epithelium, the granulation, the shape of the cells and the length of the modi®cations. Moreover, a regular, semi-embedded blood plexus always occurs around the barrel-shaped portion but rarely around the diverticula (if present, plexus irregular), and never around the swollen part of the oesophagus. These different types of modi®cations fail the similarity test and thus should be regarded as independently evolved structures and coded as different characters in a parsimony analysis. Species from other subfamilies within the Tubi®cidae were also morphologically investigated, and modi®cations of the alimentary canal were found in a few of them: Ainudrilus lutulentus, Heronidrilus bihamis, H. fastigatus (all Rhyacodrilinae) and Clitellio arenarius (Tubi®cinae). The modi®cation in segment VIII of Heronidrilus spp. resembles the barrel-shaped portion in, for example, Thalassodrilides, and should primarily be coded as the same character in a congruence test of homology.

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Section: Comparison With Other Tubi®cid Speciessupporting

confidence: 82%

Section: Oesophageal Modi®cations In Limnodriloidinaementioning

confidence: 99%

Morphology and phylogenetic implications of oesophageal modifications in the Limnodriloidinae (Oligochaeta, Tubificidae)

Gustavsson

Erséus

1999

Journal of Zoology

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“…Sorted worms were anaesthetized and fixed in 70% ethanol (Takashima and Mawatari, 1996). Fixed specimens were dehydrated through ethanol series, cleared in xylene, and mounted whole in Canada balsam.…”

Section: Methodsmentioning

confidence: 99%

“…Following several studies of marine tubificids from Japan (Baker and Brinkhurst, 1981;Brinkhurst, 1985;Ohtaka, 1987), we recently described eight species from Hokkaido, northern Japan (Takashima and Mawatari, 1996). In these studies a total of nine species belonging to five genera have been reported, but none have been described from the western part of Japan.…”

Section: Introductionmentioning

confidence: 99%

Marine Tubificidae (Oligochaeta, Annelida) from Shirahama, Western Japan, With a Description of a New Species

Takashima¹,

Mawatari²

1997

Publ. SMBL

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“…The two taxa strongly resemble each other, both in general appearance and in some details of the chaetal morphology. In particular, Tubificoides mackiei and T. pseudogaster are similar in general body length from prostomium to segment XI, the lack of hair chaetae and cuticular papillation, and in the detailed morphology of dorsal chaetae (Dahl 1960;Baker 1980;Takashima & Mawatari 1996). However, the two species can be distinguished on the basis of body width, e.g.…”

Section: Tubificoides Mackiei N Sp Figures 3-4mentioning

confidence: 99%

Two new European species of the marine genus Tubificoides (Annelida: Clitellata: Naididae) with notes on the morphology of T. pseudogaster (Dahl, 1960)

Kvist

Erséus

2018

Zootaxa

841

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Two new species of Tubificoides (subfamily Tubificinae), T. charlotteae n. sp. and T. mackiei n. sp., are described based on morphological analyses. Both species were flagged as potentially cryptic in a previous investigation, based on both mitochondrial and nuclear sequence data. Tubificoides charlotteae n. sp., known only from an intertidal site in southern Spain, is characterized by the lack of cuticular papillation, the possession of several needle-like hair chaetae in dorsal bundles, a cone-shaped penis sheath, and a rather large, muscular penial sac. It strongly resembles the north-west European, largely sublittoral species T. amplivasatus, but differs from this species in terms of body size, width of vas deferens, and the shape and size of both the ejaculatory duct and penial sac. Tubificoides mackiei n. sp., collected from the southeast coast of Norway and the west coast of Sweden, is characterized by the lack of cuticular papillae and hair chaetae, and the possession of a rather long penis sheath with a wide terminal opening. It shares several morphological features with the sympatric species Tubificoides pseudogaster, but is distinguished from the latter by the detailed morphology and length of the penis sheaths, the width of the atrium, and the lower maximal number of bifid chaetae in dorsal preclitellar bundles. The utility of an integrative comparative approach, combining molecules and morphology, for the identification and delineation of new taxa within Tubificoides is briefly discussed.

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Marine Tubificidae (Oligochaeta) from Hokkaido, Northern Japan, with Descriptions of Two New Species

Cited by 8 publications

References 19 publications

Morphology and phylogenetic implications of oesophageal modifications in the Limnodriloidinae (Oligochaeta, Tubificidae)

Morphology and phylogenetic implications of oesophageal modifications in the Limnodriloidinae (Oligochaeta, Tubificidae)

Marine Tubificidae (Oligochaeta, Annelida) from Shirahama, Western Japan, With a Description of a New Species

Two new European species of the marine genus Tubificoides (Annelida: Clitellata: Naididae) with notes on the morphology of T. pseudogaster (Dahl, 1960)

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