Lysmata ankeri 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 : 48-49

Lysmata ankeri Rhyne & Lin, 2006

Zoea I ( Figure 4 )

Size (mean ± s.d.): CL = 0.45 ± 0.04 (0.41–0.49) mm; TL = 2.78 ± 0.04 (2.72–2.83) mm.

Carapace ( Figure 4A, B ): Rostrum slender and long, reaching the end of the antennular peduncle in dorsal view; eyes sessile; one pterygostomial spine and five spines along the anterior ventral margin.

Antennule ( Figure 4A, C ): Unsegmented peduncle terminally with one long plumose seta and a small process; outer flagellum with one plumose seta, three long aesthetascs, and one short aesthetasc that ends in a spoon-shaped membrane on the distal margin; microtrichia along the proximal margin of each aesthetascs.

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

Mandibles ( Figure 4E ): Asymmetrical; palp absent; incisor and molar processes developed.

Maxillule ( Figure 4F ): Coxal endite with eight setae (two sparsely plumose setae, five plumodenticulate, and one sparsely hardy plumose); basial endite with five cuspidate setae; endopod unsegmented with two subterminal sparsely hardy plumodenticulate seta 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 4G ): Coxal endite bilobed with 8 + 3 setae (two sparsely plumose, one sparsely hardy plumose, six plumose, and two plumodenticulate); basial endite bilobed with 4 + 4 setae (four plumose, two papposerrate, and two plumodenticulate); unsegmented endopod with nine setae arranged like 3 + 2 + 1 + 3 (four sparsely plumose, one plumose, three sparsely hardy plumodenticulate, and one simple); scaphognathite with five plumose setae; microtrichia along the basial endite and scaphognathite.

First maxilliped ( Figure 4H ): Coxa with four setae (two sparsely plumose, one plumose, and one sparsely hardy plumose); basis with 11 setae (one sparsely hardy plumose, one plumose, seven sparsely plumose, and two plumodenticulate); 4-segmented endopod with 3 (two sparsely plumose setae and one simple), 1 (sparsely plumose), 2 (sparsely plumose), 4 (one subterminal simple and three terminal plumose); exopod unsegmented with one subterminal plumose setae and three terminal plumose setae).

Second maxilliped ( Figure 4I ): Coxa unarmed; basis with six sparsely plumose setae arranged like 1 + 2 + 3; 3-segmented endopod bearing 4 (two sparsely plumose setae and two simple arranged like 3 + 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 4J ): Coxa unarmed; basis with two sparsely plumose setae; endopod slightly longer than exopod and 4-segmented bearing 3 (simple setae arranged like 2 + 1), 0, 5 (denticulate seta arranged like 1 + 4), 4 (one median simple and one denticulate, one serrate, and one simple seta terminally); 5-segmented exopod bearing 3 (one median plumose seta and 1 + 1 terminal), 1 + 1, 1 + 1, 1 + 1, 3 plumose setae.

First pereiopod ( Figure 4K ): Biramous bud.

Pleon ( Figure 4A, B ): Five pleomerers; sixth pleomere not differentiated; third pleomere bearing a pair of small simple setae dorsally; fifth pleomere with a pair of dorsolateral spines and two small dorsal spines on the posterior margin. Pleopods absent.

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

FIGURE 4. Zoea I of Lysmata ankeri 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, K = 0.1 mm; E–G = 0.05 mm).