"Astacilla eminentia sp. nov.
Material
Zululand to Transkei area. Holotype SAM–A15673, SM 232, 32°14'S 29°10'E, 560-620 m, 1 d, TL 6,7 mm. Paratypes SAM–A15674, SM 103, 28°31'S 32°34'E, 680 m, 1 d, TL 6,0 mm, 3 juvs. Paratype SAM–A15675, SM 109, 28°41'S 32°36'E, 1 300 m, 1 , TL 6,3 mm. Paratypes SAM–A15676, SM 232, 560-620 m, 1 d, TL 3,5 mm, 2 Y. (damaged). Paratypes SAM–A17791, SM 250, 31°59'S 29°22'E, 150-200 m. 2 d, TL 5,1 mm, 5,3 mm. Paratypes USNM 189069, SM 226, 32°28'S 28°58'E, 710-775 m, 2 d, TL 7,1 mm, 7,0 mm.
Description
Male
Integument smooth, body elongate, especially pereonite 4, cylindrical. Head fused with pereonite 1, with lateral incision and dorsolateral groove indicating area of fusion; anterior margin strongly concave, with tiny rostral point; anterolateral and ventrolateral margin forming rim of buccal cavity; anteroventral margin projecting, trilobed. Eyes circular, barely pigmented. Pereonites 2-3 subequal; pereonite 4 elongate-cylindrical; pereonites 5-7 similar, becoming shorter posteriorly. Pleon consisting of three fused pleonites, each indicated by shallow grooves, plus narrowly triangular pleotelson: latter with posterior half dorsally flexed.
Antennule of three short peduncular articles and uniarticulate flagellum bearing nine aesthetascs distally. Antennal peduncle of two short proximal articles and three more elongate articles, fourth longest; flagellum of three or four articles. Mouth-parts typical of genus. Pereopod 1 within buccal rim, shorter than pereopods 2-4, four distal articles bearing elongate fringed setae; strong terminal spine present on dactylus, strong serrate spine on propodus. Pereopods 2-4 increasing in length posteriorly, dactyli absent: four distal articles bearing very elongate fringed setae. Pereopods 5-7 robust, with fine setules on posterior margins of five distal articles. Penis distally bifid. curved. Pleopod 2 with exopod shorter than endopod, both rami bearing elongate plumose setae; copulatory stylet attached near base of endopod, proximally inflated. distally tapering to trifid apex, extending to ends of endopodal setae. Uropod widest at midlength, narrowly tapered distally, outer ramus narrowly triangular, inner ramus tiny, bearing single terminal seta.
Female
Pereonite 4 inflated, widest at midlength; coxae and oostegites forming major part of brood-pouch.
Remarks
The present species resembles Astacilla bacillus (Barnard, 1920), recorded from False Bay to Zululand, in its overall slender-cylindrical form, but differs in several features, three of which easily separate these two species: pereonite 5 in A. bacillus is ventrally produced and markedly larger than pereonites 6 and 7; in A. eminentia, pereonite 5 is subequal to pereonites 6 and 7; the eye is pyriform and strongly pigmented in A. bacillus, circular and weakly pigmented in A. eminentia; the anterior buccal rim projects prominently (in lateral view) in A. eminentia, but is barely noticeable in A. bacillus. Size is a further separating feature, adult males of A. bacillus having a total length of 20,0 mm; adult males of A. eminentia reach 7,1 mm in total length.
Etymology
The specific name `eminentia', from the Latin meaning 'that which projects', refers to the anterior margin of the buccal rim.”
(Kensley, 1984: 230-232)
Astacilla eminentia is een pissebed uit de familie Arcturidae. De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1984 door Kensley.[1]
Bronnen, noten en/of referenties
Astacilla eminentia là một loài chân đều trong họ Arcturidae. Loài này được Kensley miêu tả khoa học năm 1984.[1]
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Astacilla eminentia là một loài chân đều trong họ Arcturidae. Loài này được Kensley miêu tả khoa học năm 1984.
