Bathytanaidinae, Larsen & Heard, 2001

Larsen, Kim & Heard, Richard W., 2001, A new tanaidacean subfamily, Bathytanaidinae (Crustacea: Paratanaididae), from the Australian continental shelf and slope, Zootaxa 19, pp. 1-22 : 20-21

Key to the genera and species of Bathytanaidinae , new subfamily

1. Antenna article 2 with anterior directed ventral process ( Fig 3 D)[ Bathytanais ]... 2

Antenna article 2 without anterior directed ventral process (Fig 10H)........... [ Pseudobathytanais ]................................................. 7

2. Antenna article 3 with both dorso­ and ventro­distal processes............... 3

Antenna article 3 without ventro­distal process............................ 5

3. Antenna article 2 not subquadrate, produced disto­ventrally into rounded lobe extending nearly to articulation of article 4; article 3 with both dorso­ and ventro­distal processes rounded (lobate)............................ B. bathybrotes

Antenna article 2 subquadrate, ventral margin produced distally into subacute process not reaching articulation of article 4; article 3 with both dorsal and ventral distal processes acute (not lobate)............................................ 4

4. Antenna article 2 ventral margin smooth (cleaver­shaped, fig. 1D). B. culterformis

Antenna article 2 ventral margin serrated (halberd­shaped).......... B. bipennifer

5. Antenna article 2 ventral projection membranous and transparent ( Fig. 6 B).................................................................. B. fragilis

Antenna article 2 ventral projection solid and not transparent................. 6

6. Antenna article 2 longer than deep; disto­ventral quadrate process not extending to articulation of article 3 and 4; article 3 not inserted dorsally into article 2. Antennule article1notswollenandclearlylongerthanwide.Labiumwithanterolateralprojections............................................................ B. juergeni

Antennal 2 article 2 as deep as long; disto­ventral quadrate process extending just past articulation of article 3 and 4; article 3 inserted dorsally into article 2. Antennule article 1 swollen and almost as wide as long. Labium without anterolateral projections ( Fig 3 D).......................................... B. arenamans

7. First pleonite with prominent dorsal anteriorly directed process (Fig 10D)................................................................ P. gibberosus

First pleonite without prominent dorsal anteriorly directed process.... P. shtokmani

Figures

FIGURE 3. Bathytanais. arenamans, female A holotype, B­L dissected paratype. A) Dorsal view. B) Cephalothorax. C) Antennule. D) Antenna. E) Labrum. F) Left mandible. G) Right mandible. H) Maxillule. I) Maxilla. J) Labium K) Maxilliped. L) Cheliped.

FIGURE 6. Bathytanais fragilis, female paratype scale bars A­B 1 mm, E­I 0.02 mm, J 0.5 mm. A) Antennule. B) Antenna. C) Labrum. D, Labium. E) Left mandible. F) Right mandible. G) Maxillule. H) Maxilla. I) Maxilliped. J) Cheliped. K) Cheliped propodus.