Kudenovythoe Salazar-Vallejo and Jimi, 2025

Kudenovythoe Salazar-Vallejo and Jimi gen. n.

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Type species. Eurythoe rullieri Fauvel, 1953 View in CoL .

Diagnosis

Amphinominae with body tetragonal, tapered. Caruncle terete, mostly detached from body wall,

to chaetiger 4–5. Branchiae branched, present from chaetiger 3 or 4, extended along anterior and regions, missing in posterior region.

Etymology

The proposed new genus group name is made by combining the last name of Dr Jerry Kudenov, and part of Eurythoe (to emphasise its affinities to this genus), in recognition of the important contributions has made on amphinomid systematics.

JOURNAL OF NATURAL HISTORY

Remarks

Kudenovythoe gen. n. resembles Eurythoe Kinberg, 1858 as revised by Bindra (1927), by having bodies provided with long chaetae, and branched branchiae. There are two main differences between two genera. First, in Kudenovythoe the caruncle is terete, mostly detached from body wall,

Eurythoe it is cushion-shaped, up to twice longer than wide, and mostly fixed to body wall. Kudenovythoe branchiae are present along anterior and median body regions, whereas in Eurythoe present along the body.

Eurythoe rullieri Fauvel, 1953 View in CoL was included in this study because it apparently did not

Eurythoe View in CoL but in Pareurythoe View in CoL based on its long, tapered caruncle, mostly detached from dorsal body However, E. rullieri View in CoL has a caruncle with thin lateral lobes, which are not present among species; because of this it approaches Eurythoe View in CoL . However, E. rullieri View in CoL also differs from all other species, as indicated above.

There are no alternative genus-group names resembling Eurythoe for species having terete

Kinberg (1867) proposed two additional genera. The first is Blenda , with B. armata Kinberg, 1867 Panama as its only species, and having smooth arched, obtuse notochaetae, and bifid

Hartman (1948, 43) studied the type and found its caruncle reaches chaetiger 3, branchiae from

2 with 5–6 filaments, and notochaetae include ‘smooth, coarser setae that appear bulbous distally they have not lost the investing sheath’. This matches Eurythoe complanata mexicana Berkeley and

1960 from Western Mexico. Hartman regarded B. armata as a junior synonym of E. complanata ( Pallas described from the Lesser Antilles.

The other genus proposed by Kinberg (1867) was Lycaretus , with L. mocephalicus Kinberg, 1867

Antilles as its only species, and Kinberg also included Amphinome abhortoni de Quatrefages, 1866 in genus. Hartman (1948, 42) noted that the type material of L. mocephalicus (listed as neocephalicus caruncles with median ridge flat and wrinkled lateral margins reaching chaetiger 4, and that branchiae ‘present from the second chaetigerm at first 5-lobed. On the third setiger there are 10 lobes, arranged’. She regarded this species as a junior synonym of E. complanata .

Eurythoe is a complex grouping of similar species that must be revised, and there are some collective moving in that direction. However, because of the unique combination of main morphological regarding the shape of caruncle and the extent of branchiae along body, we prefer to propose a new with the understanding that as currently known, Eurythoe does not include species having terete mostly detached from body wall, and branchiae restricted to the anterior and median regions;

species included in Eurythoe have cushion-shaped caruncles, mostly fixed to the body wall, and branchiae present along most chaetigers.

Kudenovythoe gen. n. resembles Alleurythoe Sun and Li, 2017 , as indicated in the key to Amphinominae below, by having caruncle straight to barely sinuous, instead of having it sigmoid, as in Pareurythoe . The differences between Kudenovythoe and Alleurythoe are in the extent of branchiae along body, and in the neurochaetae; in Kudenovythoe branchiae are present along anterior and median regions, missing in region, and neurochaetae are bifurcated with shortest tine 1/12–1/4 as long as handle width,

Alleurythoe branchiae are present along most body segments, and neurochaetae are bifurcated with tine 10–15 times longer than handle width.