Lysmata bahia Rhyne & Lin, 2006

Santos, Andréa, Alves, Douglas Fernandes Rodrigues, Barros-Alves, Samara De Paiva, Pescinelli, Régis Augusto & Costa, Rogério Caetano Da, 2023, Morphology of the early larval stages of Lysmata ankeri Rhyne & Lin, 2006 and Lysmata bahia Rhyne & Lin, 2006 (Caridea: Lysmatidae) and a review of the larval morphology of the early Lysmata stages, Zootaxa 5285 (1), pp. 41-74 : 43-45

Lysmata bahia Rhyne & Lin, 2006

Zoea I ( Figure 1 )

Size (mean ± s.d.): CL = 0.52 ± 0.03 (0.48–0.56) mm; TL = 2.63 ± 0.06 (2.51–2.71) mm.

Carapace ( Figure 1A, B ): Rostrum slender and long, longer than the antennular peduncle in dorsal view; eyes sessile; anterior dorsomedial papilla present; one pterygostomial spine and six spines along anterior ventral margin.

Antennule ( Figure 1A, C ): Unsegmented peduncle bearing a small proximal segment with a long plumose seta and a small terminal processs; outer flagellum with one plumose seta, three long aesthetascs and one short aesthetasc that ends in a spoon-shaped membrane on distal margin; microtrichia along the proximal margin of each aesthetascs.

Antenna ( Figure 1A, D ): Unsegmented peduncle; endopod with one spine and one long plumose seta; exopod (scaphocerite) 5-segmented, with nine plumose setae on inner margin (2, 1, 1, 1, 4), two plumose setae on outer margin and one simple seta on apex (1, 1, 0, 0, 1).

Mandibles ( Figure 1E ): Asymmetrical; palp absent; incisor and molar processes developed.

Maxillule ( Figure 1F ): Coxal endite with seven setae (one simple seta, five plumose, and one sparsely plumose); basial endite with five cuspidate setae; unsegmented endopod with two sparsely hardy plumodenticulate setae subterminally and three terminal setae (two sparsely hardy plumodenticulate and one sparsely plumose); microtrichia along the inner side of the coxal and basial endites.

Maxilla ( Figure 1G ): Coxal endite bilobed with 10 + 4 setae (one simple, three sparsely plumose, nine plumose, and one plumodenticulate); basial endite bilobed with 4 + 4 setae (four sparsely plumose, two papposerrate, and two plumose); unsegmented endopod with nine setae arranged like 3 + 2 + 1 + 3 (five sparsely plumose, one plumose, two sparsely hardy plumodenticulate, and one simple); scaphognathite with five plumose setae; and microtrichia along basial endite and scaphognathite.

First maxilliped ( Figure 1H ): Coxa with five setae (two sparsely plumose, two plumose, and one sparsely hardy plumose); basis with 12 setae (eight sparsely plumose, two sparsely hardy plumose, and two sparsely hardy plumodenticulate); 4-segmented endopod with 3 (one plumodenticulate, one sparsely plumose, and one simple), 1 (sparsely plumose), 2 (sparsely plumose), 3 (terminal sparsely plumose); and unsegmented exopods with one subterminal plumose seta and three terminal plumose setae.

Second maxilliped ( Figure 1I ): Coxa unarmed; basis with six setae (two simple and four sparsely plumose) arranged like 1 + 2 + 3; 3-segmented endopod bearing 3 (one sparsely plumose seta and two simple arranged like 2 + 1), 2 (sparsely plumose), 6 (one subterminal simple seta and five terminal denticulate setae); 4-segmented exopod, bearing 1 + 1, 1 + 1, 1 + 1, 4 plumose setae.

Third maxilliped ( Figure 1J ): Coxa unarmed; basis with two sparsely plumose setae; endopod slightly longer than exopod and 4-segmented, bearing 2 (simple setae), 1 (simple seta), 5 (one median denticulate seta and four terminal denticutale), 3 (one denticulate, one serrate, and one simple seta); 4-segmented exopod bearing 1 + 1, 1 + 1, 1 + 1, 3 plumose setae.

First pereiopod ( Figure 1K ): Biramous bud.

Pleon ( Figure 1A, B ): Five pleomerers; sixth non-differentiated pleomere; third pleomere bearing a pair of small simple setae dorsally; fifth pleomere with a pair of dorsolateral spines and three small dorsal spines on the posterior margin. Pleopods absent.

Telson ( Figure 1A, L ): Triangular with 7 + 7 setae (two pairs of outermost setae plumose only on the inner side); minute spines between and around the setae (except the outermost pair). Uropod absent.

Figures

FIGURE 1. Zoea I of Lysmata bahia Rhyne & Lin, 2006. A) dorsal view; B) lateral view; C) antennule; D) antenna; E) mandibles; F) maxillule; G) maxilla; H) first maxilliped; I) second maxilliped; J) third maxilliped; K) first pereiopod as bud; and L) telson. (Scale: A, B, I, J, L = 0.2 mm; C, D, H = 0.1 mm; E, F, G, K = 0.05 mm).