The state diagram of fractional-order Lü chaotic system with robust controller.

<p>The motion curves of each state of the fractional-order Lü chaotic system when control action is added at <i>t</i> = 10s.</p

Primer sequences and characterization of 26 SNPs in <i>Onchidium reevesii</i>.

<p>Primer sequences and characterization of 26 SNPs in <i>Onchidium reevesii</i>.</p

PCR primers used in gene cloning.

<p>PCR primers used in gene cloning.</p

Expression levels of the <i>NMHC II</i> gene in different tissues from four representative Onchidiidae species.

<p>S = <i>Onchidium reevesii</i>; M = <i>Platevindex mortoni</i>; R = <i>Paraoncidium reevesii</i>; V = <i>Peronia verruculata</i> (little expression in the tested tissues).</p

Sequence information of four Onchidiidae species.

<p>Sequence information of four Onchidiidae species.</p

Annotated unigenes based on gene ontology.

<p>Annotated unigenes based on gene ontology.</p

Habitats of the four studied species from the family Onchidiidae.

<p>The illustration was created using Photoshop. <i>Onchidium reevesii</i> primarily occupies wetlands, <i>Platevindex mortoni</i> can survive well in both water and wetlands, and <i>Paraoncidium reevesi</i>i and <i>Peronia verruculata</i> predominantly dwell in water. Note: The photograph outlined in red shows the dendritic gills in the dorsal skin of <i>Peronia verruculata</i>.</p

Light microscopy of the dorsal skin of four species in the Onchidiidae family.

<p>(<b>A-D</b>) An overview of the dorsal skin of (<b>A</b>) <i>Onchidium reevesii</i> (×40), (<b>B</b>) <i>Paraoncidium reevesii</i> (×40), (<b>C</b>) <i>Platevindex mortoni</i> (×40) and (<b>D</b>) <i>Peronia verruculata</i> (×40). (<b>E-H</b>) Dermis layer of (<b>E</b>) <i>O</i>. <i>reevesii</i> (×40), (<b>F</b>) <i>P</i>. <i>reevesii</i> (×40), (<b>G</b>) <i>P</i>. <i>mortoni</i> (×40) and (<b>H</b>) <i>P</i>. <i>verruculata</i> (×40). (<b>I-L</b>) Histological observation of glands in four species of Onchidiidae: (<b>I</b>) <i>O</i>. <i>reevesii</i> (×40), (<b>J</b>) <i>P</i>. <i>reevesii</i> (×40), (<b>K</b>) <i>P</i>. <i>mortoni</i> (×40), and (<b>L</b>) <i>P</i>. <i>verruculata</i> (×40). E, epidermis; D, dermis; SS, stratum spongiosum; SC, stratum compactum; CM, cuticular membrane; SCO, stratum corneum; SGR, stratum granulosum; SGE, stratum germinativum; MG, mucous gland; GG, granular gland; PC, pigment cell; MF, muscle fiber; BS, blood sinus; CP, calcium particle.</p

Phylogenetic analysis of 13 species.

<p>The names presented in non-black text highlight the main objects of this research study. The phylogenetic tree was inferred using Bayesian methods with MrBayes version 3.2.4. This tree was generated using 18S sequences.</p

Dorsal skin thicknesses of four species in the family Onchidiidae (Unit: μm).

<p>Dorsal skin thicknesses of four species in the family Onchidiidae (Unit: μm).</p