Pasiphaea

Rodrigues, Thaiana G. A. & Cardoso, Irene A., 2019, First record of four Pasiphaea Savigny, 1816 (Crustacea, Decapoda, Pasiphaeidae) species from the southwestern Atlantic, Zootaxa 4560 (2), pp. 321-330 : 329

Key to the deep-sea Pasiphaea species of the Southwestern Atlantic

1 Posterior margin of the telson forked or slightly forked....................................................... 2

- Posterior margin of telson truncate........................................................................ 3

2 Rostrum with basal slit................................................................................. 4

- Rostrum without basal slit............................................................................... 5

3 Second and third abdominal somites dorsally carinate. Merus of first pereopod unarmed. Merus of second pereopod with 1 spine on distal third......................................................... Pasiphaea merriami Schmitt, 1931

- Second and third abdominal somites dorsally rounded. Merus of first pereopod with 8–12 spines. Merus of second pereopod with 18–20 spines............................................... Pasiphaea taiwanica Komai et al., 2012 ( Fig. 3 )

4 Apex of rostrum not reaching or sometimes overreaching anterodorsal margin of carapace; deeply forked posterior margin of telson. First pereopod with 2–10 spines on merus. Second pereopod with 10–20 spines on merus............................................................................................. Pasiphaea major Hayashi, 2006 ( Fig. 2 )

- Apex of rostrum distinctly overreaching anterodorsal margin of carapace; moderately or deeply forked posterior margin of telson. First pereopod with 4–8 spines on merus. Second pereopod with 13–24 spines on merus................................................................................................. Pasiphaea tarda Krøyer, 1845 ( Fig. 4 )

5 Apex of rostrum not reaching anterodorsal margin of carapace............ Pasiphaea alcocki ( Wood-Mason, 1891) ( Fig. 1 )

- Apex of rostrum reaching anterodorsal margin of carapace..................................................... 6

6 Slightly forked posterior margin of the telson. First pereopod with 3–6 spines on merus. Second pereopod with 10–14 spines on merus............................................................. Pasiphaea antea Rodrigues et al., 2018

- Forked posterior margin of the telson. First pereopod unarmed on merus. Second pereopod with 5 spines on merus.................................................................................... Pasiphaea princeps Smith, 1884

Figures

FIGURE 1. Pasiphaea alcocki (Wood-Mason, 1891), female (15.61mm), MNRJ26958. A. Carapace, lateral view; B. Carapace, dorsal view; C. Left first pereopod, lateral view; D. Left second pereopod, lateral view; E. Sixth abdominal somite, lateral view; F. Sixth abdominal somite, dorsal view; G. Telson, dorsal view; H. Posterior margin of telson, dorsal view.

FIGURE 2. Pasiphaea major Hayashi, 2006, female (61.52mm), MNRJ 14618. A. Carapace, lateral view; B. Carapace, dorsal view; C. Right first pereopod, lateral view; D. Right second pereopod, lateral view; G. Telson, dorsal view; H. Posterior margin of telson, dorsal view. Pasiphaea major Hayashi, 2006, male (60.32mm), MNRJ14615. E. Sixth abdominal somite, lateral view; F. Sixth abdominal somite, dorsal view.

FIGURE 3. Pasiphaea taiwanica Komai, Lin & Chan, 2012, female (30.19mm), MNRJ27932. A. Carapace, lateral view; B. Carapace, dorsal view; C. Right first pereopod, lateral view; D. Right second pereopod, lateral view; E. Sixth abdominal somite, lateral view; F. Sixth abdominal somite, dorsal view; G. Telson, dorsal view; H. Posterior margin of telson, dorsal view.

FIGURE 4. Pasiphaea tarda Krøyer, 1845, male (cl: 47.33mm), MNRJ14605. A. Carapace, lateral view; B. Carapace, dorsal view; C. Right first pereopod, lateral view; D. Right second pereopod, lateral view; E. Sixth abdominal somite, lateral view; F. Sixth abdominal somite, dorsal view; G. Telson, dorsal view; H. Posterior margin of telson, dorsal view.