Paralanceola Barnard, 1930

Zeidler, Wolfgang, 2006, A review of the hyperiidean amphipod superfamily Archaeoscinoidea Vinogradov, Volkov & Semenova, 1982 (Crustacea: Amphipoda: Hyperiidea), Zootaxa 1125, pp. 1-37 : 20

Genus Paralanceola Barnard, 1930

Paralanceola Barnard, 1930: 398 . Bowman & Gruner 1973: 22. Vinogradov et al. 1982: 47.

Diagnosis

Known only from male specimens. Cuticle with hexagonal markings. Head with or without small rostrum; with slight or extended anterolateral lobe; as long as first pereonite. Eyes absent or consisting of several small ocelli. Antennae 1; peduncle 2­articulate; flagellum with elongate callynophore, 1.0–2.5x length peduncle and 2–3 small terminal articles. Antennae 2; 6–7­articulate about 0.5–0.7x length A1 or last peduncular article enlarged and flagellum whip­like, consisting of six slender articles and much longer than A1. Mandibular palp; length third article 1.2–1.5x articles 1 & 2 combined; distal half of article 3 covered with series of denticles ventrally. Maxillae 1; palp with four short, robust setae, sometimes also with additional 1–2 short, fine setae; outer lobe with 4–5 robust setae; inner lobe apically rounded, very small. Maxillae 2; inner lobe shorter than outer, with three long, robust setae; outer lobe with four long, robust setae. Maxilliped; outer lobes with outer margin covered in short, fine setae and inner margin denticulate or smooth; inner lobes fused proximally, obsolete or length about 0.25–0.7x outer lobes. Gnathopod 2; dactylus inserted terminally or subterminally. Pereopods 5–7 with retractile and hooded dactyls or dactyls only partly retractile and not hooded. Uropod 3; peduncle width about 0.6x length. Telson length 0.6x, to slightly shorter than, peduncle of U3.

Three species.

Sexual dimorphism

Paralanceola is known only from male specimens but it is likely that sexual dimorphism is similar to that found in Archaeoscina . The largest of the five specimens, referable to Paralanceola in this review, has distinct genital papillae, medially, near the base of pereopod 7. This character was not seen in any of the other specimens, presumable because they are immature, or as in the case of Archaeoscina , too small.

Remarks

Prior to this review, Paralanceola was known only from the unique type of P. anomala , a poorly preserved specimen inadequately described and illustrated by Barnard (1930). Amongst the Dana collections ( Jespersen & Tåning 1934) are five males that I have identified with Paralanceola . Four have pereopods 5–7 with fully retractile and hooded dactyls, as found in P. anomala , but they differ in several significant characters and are thus described as new to science. The remaining specimen has characters that differ from both A. anomala and the other four, particularly in that the dactyls of pereopods 5–7 are only partly retractile and not hooded. Hence it is also described as a species new to science. Thus, Paralanceola is currently represented by three species.