Xenosinelobus balanocolus, a new tanaidid genus and species (Crustacea: Peracarida: Tanaidacea) from barnacles on intertidal rocky shores and seawalls in the Singapore Strait

Abstract

This study describes a new genus and new species of Tanaidacea that was collected from inside the tests of dead Tetraclita barnacles in Singapore. Xenosinelobus n. gen. is most similar to Sinelobus but can be distinguished by the (1) unusually short antennal fifth article, (2) tooth-like lacinia mobilis on right mandible, (3) long terminal seta on epignath, (4) plumose inner seta near dactylus insertion on cheliped propodus, (5) spiniform seta on pereopod 1 coxa, (6) presence of setae on inner margins of pereopod 1 propodus and dactylus, (7) claw-like terminal articles on pereopods 2 and 3, (8) row of setulose and flattened denticulate setae along distal margin of pereopod 6 propodus, (9) dorsal seta on claws of pereopods 4–6, (10) complete row of dorso-transverse setae on pleonites 1 and 2, (11) one seta on pleopod basis outer margin, (12) two or three setae on pleopod endopod inner margin and (13) three-articled uropod with final article 1.6 times as long as preceding article. A new diagnosis and key to genera is provided for the subfamily Sinelobinae.

A new species of Zeuxo (Crustacea: Peracarida: Tanaidacea) from Japan, with remarks on carapace pigmentation as a potentially useful taxonomic character

“…The genus Zeuxo Templeton, 1840, with 37 species (Bird 2019; but see the next paragraph), is the most speciose genus in the family Tanaididae. Zeuxo differs from the other 19 confamilial genera in having the following combination of characters: (1) five free pleonites, (2) the length/width ratio of antennular article 1 more than 2.5, (3) the antenna with seven articles, (4) no distal cluster of setae on antennal article 2, and (5) the uropod with the terminal article not reduced (Sieg 1980;Bamber 2005;Bamber and Boxshall 2006;Chim and Tong 2019). Species of Zeuxo have been found from tropical to subpolar regions worldwide.…”

Dive into the sea: first molecular phylogenetic evidence of host expansion from terrestrial/freshwater to marine organisms in Mermithidae (Nematoda: Mermithida)

“…Ethanol-preserved individuals were examined for parasite infection by ventral observation under an Olympus SZX9 stereomicroscope. The identification of hosts was based on Sieg (1980), Bamber (2005), Bamber & Boxshall (2006), Kakui et al (2011), Larsen et al (2015 and Chim & Tong (2019).…”

A new brackish tanaidacean, Sinelobus kisui sp. nov. (Crustacea, Peracarida, Tanaidacea), from Japan, with a key to Sinelobus species and barcode information from two loci

“…Family Tanaididae Nobili, 1906 Genus Sinelobus Sieg, 1980 [New Japanese name: Kisui-tanaisu-zoku] Remarks. Sinelobus differs from confamilial genera in the following combination of characters: pereonite 1 not extended anterolaterally; four free pleonites; dorso-transverse plumose setal row on pleonites 1 and 2 present but incomplete (absent in mid-dorsal region); antennal article 4 without distal setal tuft; antennal article 5 at least 0.6 times length of article 4; labial outer lobe without terminal process; and prominent sexual dimorphism (Sieg 1980, Bamber 2005, Bamber and Boxshall 2006, Chim and Tong 2019.…”